There are many broad definitions of 'Information Security', but the one I like which is short and sweet is this one from Curtin University--What is Information Security. One important note to remember is that Information Security is more than just about computers and securing computers. Having said that, protecting your computers, systems and information physically is a part of 'Information Security'.
InformIT has publised a very nice artilce on defining and explaining 'Information Security', the article also explains what a 'Common Body of Knowledge (CBK)' is and explaining in brief all the 10 domains of CBK.
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